Very nice Greymule. I've been there several times. You weren't far from the upper end of Horseshoe Canyon when you were there.
Do you mean Little Wild Horse Canyon? I have hiked there. A couple of miles farther on, there are a couple of more slot canyons. 2 have water waddings, which I have not done yet, the other one (can't remember the name) was very nice and no water. It is also the closest one after Little Wild Horse.